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By Philip Cohen CLONING has made Dolly the sheep an international superstar, but the technique may not work for everybody. This week, researchers in the US have announced the surprising discovery that some animals may be genetically “unclonable”. Their finding in mice suggests that plans to clone endangered species, for instance, might fall flat if the remaining animals don’t have clone-friendly genes. “The possibility of a genetic block against this technique could have some serious repercussions,” says William Rideout of the Whitehead Institute for Biomedical Research near Boston. Sheep, mice,